Nmap is a free open source utility for network exploration or security auditing. Its design to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. Nmap runs on most types of computers and both console and graphical versions are available. Nmap is free and open source.
Can be used by beginners (-sT) or by pros alike (–packet_trace). A very versatile tool, once you fully understand the results.

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Hacker with Codname AlpHaNiX deface Google, Gmail, Youtube, Yahoo, Apple etc domains of Democratic Republic of Congo. Hacker use strategy so-called DNS cache poisoning.DNS cache poisoning is a security or data integrity compromise in the Domain Name System (DNS). The compromise occurs when data is introduced into a DNS name server's cache database that did not originate from authoritative DNS sources. It may be a deliberate attempt of a maliciously crafted attack on a name server.

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